/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package cn.fastoo.web.backstage.service.system;

import cn.fastoo.common.dao.system.RoleDao;
import cn.fastoo.common.entity.system.Permission;
import cn.fastoo.common.entity.system.Role;
import cn.fastoo.common.entity.system.UserBaseInfo;
import cn.fastoo.common.sampleframe.search.Search;
import cn.fastoo.common.sampleframe.springside.Collections3;
import cn.fastoo.common.utils.StringUtil;
import org.apache.commons.lang.StringUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authc.credential.SimpleCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.beans.factory.annotation.Autowired;

import javax.annotation.PostConstruct;
import java.io.Serializable;
import java.util.List;

public class ShiroDbRealm extends AuthorizingRealm {

	@Autowired
	protected SystemService systemService;
	@Autowired
	protected RoleDao roleDao;
	/**
	 * 认证回调函数,登录时调用.
	 */
	@Override
	protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken) throws AuthenticationException {
		UsernamePasswordToken token = (UsernamePasswordToken) authcToken;
		UserBaseInfo user = systemService.findUserBaseInfoByLoginName(token.getUsername());
		if (user != null) {
//			if ("disabled".equals(rsync.getStatus().toString())) {
//				throw new DisabledAccountException();
//			}
//			byte[] salt = Encodes.decodeHex(rsync.getSalt());
			ShiroUser shiroUser  = new ShiroUser(user.getLoginName(), user.getName());
			shiroUser.id = user.getId();
			return new SimpleAuthenticationInfo(shiroUser , user.getPassword(), getName());
//			return new SimpleAuthenticationInfo(new ShiroUser(rsync.getLoginName(), rsync.getName()), rsync.getPassword(), ByteSource.Util.bytes(salt), getName());
		} else {
			return null;
		}
	}

	/**
	 * 授权查询回调函数, 进行鉴权但缓存中无用户的授权信息时调用.
	 */
	@Override
	protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
		ShiroUser shiroUser = (ShiroUser) principals.getPrimaryPrincipal(); 
		UserBaseInfo user = systemService.findUserBaseInfoByLoginName(shiroUser.loginName);
		SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
		List<Role> roles = null;
		if(StringUtils.isNotBlank(user.getRoleIds())){
			roles = roleDao.find(new Search().addSearchFilter("IN_id",user.getRoleIds()));
		}

		if(Collections3.isNotEmpty(roles)){
			for (Role role : roles) {
				// 基于Role的权限信息
				info.addRole(role.getRole());
				// 基于Permission的权限信息
				// List<Permission> permissionList = role.getPermissionList();
				List<Permission> permissionList = roleDao.getPermissionByRecursively(role);
				for (Permission permission : permissionList) {
					info.addStringPermission(permission.getPermission());
				}
			}
		}
		return info;
	}

	/**
	 * 设定Password校验的Hash算法与迭代次数.
	 */
//	@PostConstruct
//	public void initCredentialsMatcher() {
//		HashedCredentialsMatcher matcher = new HashedCredentialsMatcher(SystemService.HASH_ALGORITHM);
//		matcher.setHashIterations(SystemService.HASH_INTERATIONS);
//
//		setCredentialsMatcher(matcher);
//	}
	@PostConstruct  
	public void initCredentialsMatcher() {  
			//该句作用是重写shiro的密码验证，让shiro用我自己的验证  
	        setCredentialsMatcher(new CustomCredentialsMatcher());  
	}




	class CustomCredentialsMatcher extends SimpleCredentialsMatcher {
	     @Override  
	        public boolean doCredentialsMatch(AuthenticationToken authcToken, AuthenticationInfo info) {  
	            UsernamePasswordToken token = (UsernamePasswordToken) authcToken;  
	            Object tokenCredentials = String.valueOf(token.getPassword());  
	            Object accountCredentials = getCredentials(info);  
	            //将密码加密与系统加密后的密码校验，内容一致就返回true,不一致就返回false  
	            return equals(tokenCredentials, accountCredentials);  
	        }  
	   
	}  
	/**
	 * 自定义Authentication对象，使得Subject除了携带用户的登录名外还可以携带更多信息.
	 */
	public static class ShiroUser implements Serializable {
		private static final long serialVersionUID = -1373760761780840081L;
		public String loginName;
		public String name;
		public Long id;

		public ShiroUser(String loginName, String name) {
			this.loginName = loginName;
			this.name = name;
		}

		public String getName() {
			return name;
		}

		/**
		 * 本函数输出将作为默认的<shiro:principal/>输出.
		 */
		@Override
		public String toString() {
			return loginName;
		}

		/**
		 * 重载hashCode,只计算loginName;
		 */
		@Override
		public int hashCode() {
			return loginName.hashCode();
		}

		/**
		 * 重载equals,只计算loginName;
		 */
		@Override
		public boolean equals(Object obj) {
			if (this == obj) {
				return true;
			}
			if (obj == null) {
				return false;
			}
			if (getClass() != obj.getClass()) {
				return false;
			}
			ShiroUser other = (ShiroUser) obj;
			if (loginName == null) {
				if (other.loginName != null) {
					return false;
				}
			} else if (!loginName.equals(other.loginName)) {
				return false;
			}
			return true;
		}
	}
	
	 
}
